Derivative Financial Instruments (Mortgage banking activities) (Details 6) (Derivative used in Mortgage Banking Activities [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative assets:
Total derivative assets	$ 8,387	$ 13,943
Derivative liabilities:
Total derivative liabilities	(10,326)	(2,191)
Net derivative asset (liability)	(1,939)	11,752
Interest rate lock agreements [Member]
Derivative assets:
Total derivative assets	8,127	13,180
Derivative liabilities:
Total derivative liabilities	(99)	(33)
Forward trades and options [Member]
Derivative assets:
Total derivative assets	260	763
Derivative liabilities:
Total derivative liabilities	$ (10,227)	$ (2,158)